改性硅藻土对氨氮的吸附行为  

Adsorption behavior of modified diatomite for ammonia

作　　者：王芳[1] 

机构地区：[1]滨州学院化学工程系滨州市材料化学重点实验室,山东滨州256600

出　　处：《应用化工》2015年第3期478-481,共4页Applied Chemical Industry

基　　金：山东省自然科学基金项目(ZR2014BL014);山东省高等学校科技计划项目(J14LC54);滨州市科学技术发展计划项目(2014ZC0212);滨州学院基金项目(2010Y06;BZXYFB20140806;BZXYFB20100403;BZXYQNLG200912)

摘　　要：用过渡金属(Fe、Cu、Zn)改性硅藻土,利用红外吸收光谱(IR)表征了改性前后硅藻土的结构,并研究了其对氨氮的吸附行为。结果表明,Fe的添加能在一定程度上提高硅藻土吸附氨氮性能。此外,分别采用准一级动力学方程、准二级动力学方程和颗粒内扩散方程对改性硅藻土吸附氨氮行为进行拟合。结果显示,改性硅藻土对氨氮的吸附过程可用Langmuir吸附等温方程较好地拟合,在温度为25℃时,单分子层饱和吸附量为8.11 mg/g,其吸附动力学较符合准二级反应动力学方程。Diatomite was modified with transition metal（ Zn,Fe,Cu） by using impregnation method,and the performance of ammonia adsorption was measured. The structure of the zeolites before and after modification was analyzed by means of infrared spectrometry. Results show that the performance of modified diatomite can be enhanced in a certain extent by the addition of surfactant. In addition,the kinetic data were respectively fitted by pseudo-first-order equation,pseudo-second-order equation and the intra-particle diffusion model. The results show that the adsorption of ammonia on modified diatomite could be well fitted by Langmuir isotherms equation,and the theoretical maximum adsorption capacity is 8. 11 mg / g,at25 ℃. The dynamic adsorption data were well described by pseudo-second-order reaction rate model.

关 键 词：过渡金属 硅藻土 氨氮 

分 类 号：TQ111.19[化学工程—无机化工] TQ013.2